I have a lot of high-minded reasons for doing almost all my summer shopping at the Boulder Farmers' Market. I worry about climate change, soil erosion, bee die-off, genetically modified foods and the flood of pesticides contaminating soil, sea, air and our bodies. I know small farmers must be supported if we want a reliable food supply because variety, ubiquity and ingenuity produce a robust system while big agriculture is so swollen, profit-hungry and conscienceless it's bound to topple. The food big ag produces barely nourishes. Financial shenanigans I only half understand periodically take staples off the shelves or make them unaffordable -- as when the government decides to utilize its mountains of subsidized corn for fuel instead of food and prices spike; or we flood other countries with corn so cheap it destroys their farmers. Large-scale monocropping means a single pest or virus can decimate acres of field or orchard. Animals are horribly abused and the resultant meat is often contaminated. As for waste and fuel expenditure: We send shrimp to China to be shelled, de-veined and returned to U.S. tables. How sustainable is that?